Journal
ASTROPHYSICAL JOURNAL
Volume 755, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/755/1/37
Keywords
infrared: stars; novae, cataclysmic variables; stars: abundances; stars: individual (V1974 Cygni, V382 Velorum, V1494 Aquilae)
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Funding
- NASA/JPL Spitzer [1289430, 1314757, 1267992, 1256406, 1215746]
- The United States Air Force
- National Science Foundation
- NSF
- NASA
- Spitzer
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1007977] Funding Source: National Science Foundation
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We present Spitzer Space Telescope mid-infrared IRS spectra, supplemented by ground-based optical observations, of the classical novae V1974 Cyg, V382Vel, and V1494 Aql more than 11, 8, and 4 years after outburst, respectively. The spectra are dominated by forbidden emission from neon and oxygen, though in some cases, there are weak signatures of magnesium, sulfur, and argon. We investigate the geometry and distribution of the late time ejecta by examination of the emission line profiles. Using nebular analysis in the low-density regime, we estimate lower limits on the abundances in these novae. In V1974 Cyg and V382 Vel, our observations confirm the abundance estimates presented by other authors and support the claims that these eruptions occurred on ONe white dwarfs (WDs). We report the first detection of neon emission in V1494 Aql and show that the system most likely contains a COWD.
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